20846989078 has 4 divisors (see below), whose sum is σ = 31270483620. Its totient is φ = 10423494538.

The previous prime is 20846989049. The next prime is 20846989103. The reversal of 20846989078 is 87098964802.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5211747268 + ... + 5211747271.

It is an arithmetic number, because the mean of its divisors is an integer number (7817620905).

Almost surely, 2^20846989078 is an apocalyptic number.

20846989078 is a deficient number, since it is larger than the sum of its proper divisors (10423494542).

20846989078 is a wasteful number, since it uses less digits than its factorization.

20846989078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10423494541.

The product of its (nonzero) digits is 13934592, while the sum is 61.

The spelling of 20846989078 in words is "twenty billion, eight hundred forty-six million, nine hundred eighty-nine thousand, seventy-eight".